'16 Speed Triple Front Brake Issue (Brembo) - Page 10 - Triumph Forum: Triumph Rat Motorcycle Forums
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post #91 of 121 (permalink) Old 09-10-2019, 09:34 PM
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I seem to have gotten the Brembo blues. Instead of riding and lever going mush it was parked and I grab the brake as I mount and Kablam right to the grip 3 times then got stiffer in one pull. This does not feel like the calipers but the master for sure. Brakes were flawless the rest of the day. Im getting an RCS master for sure.

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post #92 of 121 (permalink) Old 09-11-2019, 12:09 AM
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Try bleeding the lever
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post #93 of 121 (permalink) Old 09-11-2019, 10:01 AM
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My suspicion as well, I think the sponginess happens when bike sits for a long period of time so logically micro bubbles accumulate at the master pump. I found a video that shows how to bleed the master without the $30 bleeder pump.
https://youtu.be/D6qNk78O_uo
Update: discernible “big” bubble came up at first pump, then small clusters of them at second and third steps (closing nipple and reopening) hopefully this will fix this nightmare.
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post #94 of 121 (permalink) Old 09-11-2019, 11:50 AM
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Quote:
Originally Posted by Nicspeed View Post
....I found a video that shows how to bleed the master without the $30 bleeder pump.
https://youtu.be/D6qNk78O_uo
Update: discernible big bubble came up at first pump, then small clusters of them at second and third steps (closing nipple and reopening) hopefully this will fix this nightmare.
That is a great, concise vid.

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post #95 of 121 (permalink) Old 09-13-2019, 09:47 PM
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Quote:
Originally Posted by Nicspeed View Post
My suspicion as well, I think the sponginess happens when bike sits for a long period of time so logically micro bubbles accumulate at the master pump. I found a video that shows how to bleed the master without the $30 bleeder pump.
https://youtu.be/D6qNk78O_uo
Update: discernible big bubble came up at first pump, then small clusters of them at second and third steps (closing nipple and reopening) hopefully this will fix this nightmare.
Nothing new revealed in the video. This is how I have bleed my race car brakes and Speed 3R too, plus the pull/push technique, but to no avail.
I don't know how the dealer did it TWICE!!!, but the sponginess returns every time.
The logical explanation (already given) at the beginning of this thread is the reason.
Rebuilding the calipers with new seals is the ticket to try.

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post #96 of 121 (permalink) Old 09-16-2019, 09:40 PM
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There may be multiple issues at play here. One is a soft feel on the first pull of the lever that corrects itself if you do a kind of double tap. The other issue is definitely a slow air leak over time. My 2016 has sat in the garage for a few months, ridden only once after having the brakes bled by a Triumph mechanic.

Every week I'd pull the brake lever to see how it felt. Over time it got softer and softer, until even multiple pumps on the lever would not keep it from dropping to the grip.

This weekend I bled the whole system. A lot of air came from the first caliper, the front left (furthest from the master). But, the air only came out after a lot of pumps, and 2 fluid reservoirs of brake fluid. So, my guess is that the air came from close to the master cylinder. No air came out of the right caliper, no air came out of the ABS pump, and only a very small amount came out of the master. Zipped tied over night, no air in the morning. Front brake is solid, or about as solid as it was new.

No fluid can be seen to be leaking from anywhere. But air is definitely getting into the system somewhere. Bike is out of warranty so I'd like to fix this myself but I have no idea where to start since I see no signs of leaks.
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post #97 of 121 (permalink) Old 09-16-2019, 10:24 PM
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If the brakes are a close system, except for the top of the reservoir, then for air to get in, there must be a leak somewhere.

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post #98 of 121 (permalink) Old 09-16-2019, 10:39 PM
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Ever wonder why this only happens on bikes. Cars seem to have no problem with their setup, except when road racing and boil the brake fluid.
Even then I can control the fade by not pushing the car so hard and cooling the calipers. I know some dot 5 fluids let water in if sitting for a few weeks. Just weird.

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post #99 of 121 (permalink) Old 09-17-2019, 09:30 AM
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Quote:
Originally Posted by Red Baron View Post
If the brakes are a close system, except for the top of the reservoir, then for air to get in, there must be a leak somewhere.
Yes, I wasn't clear in my statement about a leak. There's definitely an air leak. But, I don't see a fluid leak in exchange so I don't know where to start in the trouble shooting. I've read others with the Brembo master cylinder, including late model Daytona 675's have had trouble keeping their systems bled. While I would love to be able to justify buying a Brembo 19RCS, I also don't want to buy a new master cylinder if that's not the culprit.
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post #100 of 121 (permalink) Old 09-17-2019, 10:55 AM
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Anyone know where to get a seal kit for the OE calipers that isn't $160 per side (the price on Bike Bandit, which I assume is close to the Triumph price)?

Looks like Oppracing.com has a large variety of seal kits, I'm just unsure which one fits our OE calipers: https://www.oppracing.com/category/7...acement-parts/
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